[ 'stɛθəskəʊp ]
■ noun a medical instrument for listening to the action of someone's heart or breathing, having a small disc-shaped resonator that is placed against the chest and two tubes connected to earpieces.
Derivatives
stethoscopic adjective
Origin
C19: from Fr. stéthoscope , from Gk stēthos 'breast' + skopein 'look at'.